JPS6256410B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner equipped with a dehumidifying operation function.

Conventionally, in this type of air conditioner, the compressor is operated continuously during dehumidification operation, so depending on the indoor humidity situation, unnecessary operation may continue, resulting in wasted electricity. may be consumed. Therefore, in order to solve this problem, we can control the operation of the compressor on and off according to changes in the indoor temperature, and also install a humidity detector that detects the indoor humidity. Some systems control the operation of the compressor on and off depending on the results. However, if the compressor is controlled to be turned on and off in response to changes in indoor temperature, it is naturally impossible to perform optimal dehumidifying operation depending on the indoor humidity situation. Additionally, devices equipped with a humidity detector are expensive and susceptible to dust and oil in the air, leading to increased costs and reduced reliability. There's a problem.

This invention was made in view of the above circumstances, and its purpose is to reduce power consumption, enable optimal dehumidification operation according to indoor humidity conditions, reduce costs, and improve reliability. The present invention provides an excellent air conditioner that also makes it possible to improve performance.

An embodiment of the present invention will be described below with reference to the drawings. In Fig. 1, reference numeral 1 denotes a remote control type operating unit, and a changeover switch 2 for switching between cooling operation and dehumidification operation is provided at the lower part of the operating unit 1, and a room temperature control unit is provided further below the changeover switch 2. A sliding common operating section 3 having a dehumidification operation rate setting function and a dehumidification operation rate setting function is provided. By sliding the knob ₃₁ to the right in the figure, the common operation section 3 can sequentially set the indoor temperature (°C) from a high temperature state to a low temperature state, and also allows the operating rate of the compressor (%) during dehumidification operation. ) can be set sequentially from 0 (%) to 100 (%).

Figure 2 shows the refrigeration cycle. That is, a compressor 10, an outdoor heat exchanger 11, a pressure reducing device such as a capillary tube 12, a first indoor heat exchanger 13,
A pressure reducing device such as a capillary tube 14 and a second indoor heat exchanger 15 are connected in sequence to form a refrigeration cycle. A two-way valve 16 that opens during dehumidification operation is connected in parallel to the capillary tube 12. Furthermore, a two-way valve 17 that opens during cooling operation is connected in parallel to the capillary tube 14. That is, during cooling operation, the opening operation of the two-way valve 17 forms a refrigerant bypass path for the capillary tube 14, so that the first indoor heat exchanger 13 operates in the same manner as the second indoor heat exchanger 15. It is designed to act as an evaporator. Furthermore, during dehumidification operation, a bypass path is formed for the capillary tube 12 by the opening operation of the two-way valve 16, so that the first indoor heat exchanger 13 acts as a condenser like the outdoor heat exchanger 11. I'm starting to do that. Furthermore, outdoor air is circulated through the outdoor heat exchanger 11 by an outdoor blower 18. Further, indoor air is circulated through the first and second indoor heat exchangers 13 and 15 by an indoor blower 19.

FIG. 3 shows the control circuit. The AC power supply 20 includes
A main control section 22 is connected via a transformer 21. This main control section 22 is composed of a microcomputer and its peripheral circuits, and is connected to a relay 23 that responds to an operation switch (not shown) provided in the operation operation section 1 and a compressor motor ₁₀₁ to be described later. First and second switches, such as relays 24 and 25, are provided to control opening and closing of the energized path. The main control section 22 includes an indoor temperature detector such as a thermistor 26 and a knob 3 in the common operating section 3.
A variable resistor 27 whose resistance value changes in accordance with the slide of ₁ is connected. The thermistor 26 above
has the opposite characteristic that the resistance value increases as the indoor temperature decreases. Further, the resistance value of the variable resistor 27 increases as the set indoor temperature decreases and the set dehumidification operation rate increases.

One end of the blower motor 19 ₁ of the indoor blower 19 is connected to, for example, a voltage variable circuit (not shown) of the main control unit 22 , and the other end of the blower motor 19 ₁ is connected to the relay 23 . It is connected to the other end of the power supply 20 via the normally open contact 23a. That is, the main control section 22 can change the rotational speed of the blower motor ₁₉₁ . The relay 24 is connected to one end of the power supply 20.
One end of the electromagnetic coil 171 of the two-way valve ₁₇ is connected through a normally open contact 24a, and the other end of the electromagnetic coil ₁₇₁ is connected to the other end of the power source 20 via a contact 23a. On the other hand, when the changeover switch 2 is set to "cooling", the cooling side contact (between movable terminal ₂₀ and fixed terminal ₂₁ ) is closed, and when it is set to "dehumidification", the dehumidification side contact is closed. The contact (between the movable terminal ₂₀ and the fixed terminal ₂₂ ) is configured to close. Thus, one end of the power supply 20 has a contact 24a, a cooling side contact of the changeover switch 2,
and one end of the blower motor ₁₈₁ of the outdoor blower 18 is connected via the terminal of the terminal board 30,
The other end of the blower motor ₁₈₁ is connected to the other end of the power source 20 via the terminal of the terminal board 30 and the contact 23a. Furthermore, one end of the compressor motor 101 that drives the compressor 10 is connected to one end of the power supply 20 via a contact 24a, a cooling side contact of the changeover switch 2, a terminal, and a current overload relay ₃₁ . The other end of the motor ₁₀₁ is connected to the other end of the power source 20 via a terminal and a contact 23a. Note that one end of the compressor motor ₁₀₁ is also connected to one end of the power source 20 via the normally open contact 25a of the relay 25, the dehumidification side contact and terminal of the changeover switch 2, and the current overload relay 31. Further, the two-way valve 16 is connected to one end of the power supply 20 via the contact 25a and the terminal of the terminal board 30.
One end of the electromagnetic coil ₁₆₁ is connected to the electromagnetic coil 161, and the other end of the electromagnetic coil ₁₆₁ is connected to the other end of the power source 20 via a terminal and contact 23a.

Here, the main circuits of the main control section 22 will be explained with reference to FIG. A DC voltage V is supplied to the thermistor 26 via a resistor 41. Further, a DC voltage V is supplied to the variable resistor 27 via a resistor 42. Furthermore, the change in potential at the connection point a between the resistor 41 and thermistor 26
The comparator 43 compares the potential at the connection point b between the variable resistor 2 and the variable resistor 27 as a reference. The comparison output of this comparator 43 is the output of the NPN type transistor 44.
supplied to the base of And the relay 24
A DC voltage V is supplied to the transistor 44 between its collector and emitter. In this way, if the potential at the connection point a is higher than the potential at the connection point b, that is, if the indoor temperature is higher than the set temperature, the output of the comparator 43 becomes a high potential, the transistor 44 turns on, and the relay 24 operates. It's becoming like that. On the other hand, the voltage obtained at connection point b is
The signal is supplied to the timer 45. This timer 45 utilizes the arithmetic circuit of a microcomputer, and turns on the duty according to the voltage at connection point b.
It is designed to emit an off signal. That is,
The timer 45 lengthens the output period of the logic "1" signal and shortens the output period of the logic "0" signal as the voltage at the connection point b increases. Therefore, the output of timer 45 is NPN
to the base of a transistor 46. A DC voltage V is supplied to the relay 25 via the collector and emitter of the transistor 46. In this way, when the potential at the connection point b increases, that is, when the dehumidification operation rate is set to a high state, the period of the logic "1" signal output from the timer 45 becomes longer, and as a result, the period of the logic "1" signal output from the timer 45 becomes longer.
The ON time of the relay 25 becomes longer, so that the operating time of the relay 25 becomes longer.

Next, the operation in the above configuration will be explained. Now, set the changeover switch 2 of the driving operation section 1 to "cooling" and set the desired indoor temperature using the common operation section 3. When the preparation for the cooling operation is thus completed, the operation switch (not shown) in the operation operation section 1 is turned on. Then, the relay 23 operates, and the closing of the contact 23a causes the blower motor ₁₉₁ to operate. That is, the operation of the indoor blower 19 is started. At this time, if the indoor temperature based on the resistance value of the thermistor 26 is higher than the set temperature, the relay 24 operates,
By closing the contact 24a, the electromagnetic coil 17
₁ , blower motor 18 ₁ and compressor motor 10
₁ works respectively. That is, the two-way valve 17 is opened to form a refrigerant bypass path to the capillary tube 14, and the outdoor blower 18 and the compressor 10 are started to operate, thereby performing a cooling operation. Then, when the indoor temperature becomes lower than the set temperature, the operation of the relay 24 is stopped, and the operation of the outdoor blower 18 and the compressor 10 is stopped by opening the contact point 24a, and the cooling operation is interrupted. By the way, during such a cooling operation, the dehumidifying operation rate is also set in conjunction with the setting of the indoor temperature in the common operation unit 3, so the relay 25 operates according to the output of the timer 45, and the opening and closing of the contact 25a is performed. However, this operation is invalid because the dehumidification side contact of the changeover switch 2 (between the movable terminal ₂₀ and the fixed terminal ₂₂ ) is open.

In addition, the changeover switch 2 of the operation control section 1 is set to "dehumidification", and the common operation section 3 is used to set a desired dehumidification operation rate. In this case, the dehumidification operation rate is set to 100 (%), for example, during high humidity such as during the rainy season. Further, when the humidity is relatively low, the dehumidification operation rate is set to, for example, 50 (%) or less. In this way, when the preparation for dehumidification operation is completed, the operation section 1
Turn on the operation switch (not shown) at . Then, the relay 23 operates and its contact 2
By closing 3a, the blower motor ₁₉₁ is operated. That is, the operation of the indoor blower 19 is started. At this time, the output duty of the timer 45 is set according to a preset dehumidifying operation rate, and the relay 25 operates according to the output of the timer 45. In this way, when the contact 25a is closed,
The electromagnetic coil 16 ₁ , the blower motor 18 ₁ and the compressor motor 10 ₁ operate. That is, the two-way valve 16 is opened to form a refrigerant bypass path to the capillary tube 12, and the outdoor blower 18 and compressor 10 are started to operate.
Dehumidification operation will be implemented. When the output of the timer 45 becomes a logic "0" signal and the operation of the relay 25 is stopped, the operation of the outdoor blower 18 and the compressor 10 is stopped by opening the contact 25a, and the dehumidification operation is interrupted. By the way, the range of change in the dehumidifying operation rate is from a minimum of 3 minutes (the minimum time required for the compressor 10 to function) to a maximum of 15 minutes.
minutes (to reduce indoor humidity changes).
The operation off time is set to be from a maximum of 15 minutes to a minimum of 2 minutes and 30 seconds (taking safety into account for restarting the compressor 10). Further, during dehumidification operation, the indoor temperature is also set as the indoor temperature is set in the common operation section 3, so the relay 24 operates and its contacts 24a are opened and closed. This is invalid because the cooling side contact (between the movable terminal ₂₀ and the fixed terminal ₂₁ ) is open.

Therefore, by being able to vary the dehumidifying operation rate, it is possible to perform optimal dehumidifying operation according to the indoor humidity situation, prevent unnecessary operation, and reduce power consumption. Moreover, since there is no need to provide a humidity detector, it is possible to reduce costs and improve reliability. Furthermore, since the indoor temperature and the dehumidification operation rate can be set using a common operating section, the configuration of the operating section can be simplified. Furthermore, since the direction of the indoor temperature scale and the direction of the dehumidification operation rate scale in this common operation section correspond to each other regarding on-off control of compressor operation, it is very convenient for the person performing the setting operation. It is convenient for

In the above embodiment, the dehumidifying operation is performed by having two indoor heat exchangers and using one of the indoor heat exchangers as a reheater. The same method can be applied to those using . In addition, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without changing the gist.

In an air conditioner equipped with a refrigeration cycle having a compressor and having at least cooling and dehumidifying operation functions, an indoor temperature detector for detecting indoor temperature, an indoor temperature scale and a dehumidification operation rate scale, and the direction of both scales. compares a common operating unit for indoor temperature setting and dehumidification operation rate setting that correspond to each other regarding on-off control of the operation of the compressor, and a set value of this common operating unit and a detection result of the indoor temperature detector. a first switch that responds to the output of the comparator, a timer that issues a duty on/off signal according to a setting value of the operating section, and a second switch that responds to the output of the timer; A changeover switch for switching between cooling and dehumidification operation is provided, the drive motor of the compressor is connected to the power source via the cooling side contacts of the first switch and the changeover switch, and the second switch and the changeover switch Since it is connected to the power supply via the dehumidifying side contact, it reduces power consumption and enables optimal dehumidifying operation depending on the indoor humidity situation.It also reduces costs and improves reliability. A harmonizer can be provided.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention.
The figure shows a partial configuration diagram of the operation control unit, Figure 2 is a configuration diagram schematically showing the refrigeration cycle, Figure 3 is a configuration diagram of the control circuit, and Figure 4 is a configuration diagram of the main circuits in the main control unit. be. 3...Common operation unit, 10...Compressor, 24...First switch (relay), 25...Second switch (relay), 26...Indoor temperature detector (thermistor).

Claims (1)

[Claims] 1. An air conditioner equipped with a refrigeration cycle having a compressor and having at least cooling and dehumidifying operation functions, which has an indoor temperature detector that detects the indoor temperature, an indoor temperature scale and a dehumidification operation rate scale, and a A common operating section for setting an indoor temperature and a dehumidifying operation rate whose directions correspond to each other regarding on-off control of the operation of the compressor, and a set value of this common operating section and a detection result of the indoor temperature detector. A comparator for comparison, a first switch that responds to the output of this comparator, a timer that issues a duty on/off signal according to the setting value of the operating section, and a second switch that responds to the output of this timer. , a changeover switch for switching between cooling and dehumidification operation, and a drive motor for the compressor,
An air conditioner characterized in that the first switch and the changeover switch are connected to a power supply through cooling side contacts, and the second switch and the changeover switch are connected to a power supply through dehumidification side contacts.